Fuel feeding device for internal combustion engines



June 6, 1939.. F mzspom 1, FUEL; FEEDING DEVICE FOR INTERNAL COMBUSTION ENGINES-J Fil e dxsept. 4, 19:57

UNITED STATES PATENT OFFICE FUEL FEEDING DEVICE FOR INTERNAL COMBUSTION ENGINES Fritz Egersdiirl'er, Berlin, Germany Application September 4.1937, Serial No. 162,430 In Germany September 26, 1932 2 Claims.

My invention relates to improvements in fuel feedingjdevices for internal combustion engines, and more particularly in fuel feeding devices of the type in which the fuel is injected by means of a pump. One of the objects of the improvements is to provide a device of this type by means of which accurate amounts of fuel are delivered. Another object of the improvements is to provide a device which is simple in construction and reliable in operation. Further an object of the improvements is to providea device by means of which the amounts of fuel can be accurately regulated in such a way that with any number of revolutions of the engine a substantially uniform mixture of fuel and air forsupporting combustion is insured. With these and other objects in view my invention consists in constructing the fuel feeding device in the form of ,a pump comprising a pair or pairs of interengaging gear wheels rotating within a common casing and having suction and pressure conduits located respectively at opposite sides of the line of engagement of the said gear wheels, the pressure conduit of the said pump being connected with a distributing memberlocated within the body of the pump pump and the fuel controlling member associ-- ated therewith,

Fig. 2 is a sectional plan view taken on the line 2.2 of Fig. 1, 1 Fig. 3 is a sectional elevation taken on the line 3+3 of Fig. 1,

I Fig. 4 isa sectional elevationtaken on the line 44 of Fig. 1,

Figs. 5 to 7 are diagrammatical plan views on an enlarged scale showing the operation of the controlling slots in the different positions ofthe distributing member.

The feeding device comprises a casing composed of a cylinder I and heads 2 and 3, and a pair of interengaging gear wheels 4 and. 5 fixed respec-.

ings fl, 9, III, and II fitted within the cylinder I,

the bushing 9 being if desired made integral with the head 3 At oppmite sides of the lineof inter- I section of the gear wheels I and 5 suction and pressure conduits l2 and I3 are provided in the wall of the cylinder I, and the suction conduitis connected with a supply of fuel.

The head 2 is made integral with a block I located axially of the shaft 6, and in a concentric cylindrical recess of the said block a distributing member I5 is located which is connected with the shaft 6 or a shaft section 6 connected therewith. At the inner end of the distributing member I5 a recess I5 is formed in the block II which is connected with the pressure conduit I3 through a passage I1, and the said recess communicates with a concentric chamber I8 made in the member I5. The block I4 is formed with radial arms I9 formed with radial sockets 20 in being held by springs with their inner ends in engagement with the member I5. The sockets 20 of the lugs III are closed by disks 22 formed with studs 23.

The said studs and the inner portions of the plungers 2| are formed with axial bores .which plungers 2| are located, the said plungers 24 and 25 respectively, and the bores25 areco'nnected with-angularly disposed slots 26. "The distributing member I5 is formed with an angular slot 21 crossing the slots 26 at right angles and 7 connected with the chamber I8- through a bore 28. The studs 23 are externally screw-threaded, and they are connected through pipes with the fuel nozzles of the cylinders of the engine.

The distributing member I5 is axially shiftable withingthe block ,for varying the relation between the slots 26 and 21 and for this purpose the member I5 is formed at its outer end with a neck 30 engaged by a leverv 3 I, the said lever being connected with a governor or a hand operated controlling device such as the accelerator.

The shaft 6 is connected with the main driving shaft of the engine. I

In the operation of the device fuel is supplied by means of the gear wheels I and 5 to the recess I6 and the concentric chamber I8. By the rotary movement of the member I5 the slot 21 successively establishes communication 1 ,between the said chamber I8 and the bores 25, 24, so that successively' regulated amounts of fuel are supplied through the saidbores to the cylinders of the engine. For regulating the supply of fuel the member I5 is shifted axially by means ,of the lever 3i. Thereby the relation of theslots 2G and .28 is varied in the manner shown in Figs. 5- to 7. In the position of the parts shown in Fig. 5

the path of the slot 21 corresponds to the position of the slots 26, and therefore fuel is supplied through the slots 26 a length of time corresponding to the circumferential length of the slots 20. When the member I! is axially shifted with the slot 21 and into the position represented in Fig. 8 the said slots communicate with each other only'through a reduced length of time, and therefore the amount of fuel supplied to the cylinders is reduced. When the member II is further shifted the slots finally get into therelative positions indicated in Fig. '7, in which no fuel is supplied.

The dimensions of the device are such that the gear wheels 4, 8 supply more fuel than is ordinarily needed, and the excess of fuel escapes from the controlling device through an annular recess II and a passage 34 to the suction passage I2, the plungers 2| slightly yielding against the pres-: sure of their springs in case of an excess of fuel being supplied to the distributing device.

I claim:

1. In a fuel-feeding device for internal-combustion engines, fuel-distributing means including a cylindrical valve chest, a valve in the form of a cylindrical shell rotatable within and longitudinally adjustable within the valve chest, the valve chest being ported with a plurality of elongated slots arranged in circumferential succession, and the valve being ported with an elon- "gated slot, the slot in the valve being angularly disposed with relation to the slots in the chest, whereby as the valve rotates the area of coincidence of the two cooperating slots advances longitudinally of the slots, and means for. shifting the valve longitudinally within the valve chest.

2. In a fuel-feeding device for internal-combustion engines,fuel-distributing means including acylindrical valve chest, a valve in the form of a cylindrical shell rotatable within and iongitudinally adjustable within the valve chest, the valve chest being ported with a plurality of ports arranged in circumferential succession, and the valve being ported with a port adapted as the valve rotates to register with the ports in the valve chest, the valve chest including in its structure blocks yieldingly mounted in its walls, in which blocks the said ports are formed, and a pressure-relief passage, thesaid blocks constituting valves in a line of fuel flow from said valve chest to said pressure-relief passage, and means for shifting the valve longitudinally within the valve chest.

FRITZ EGERSDORFER. 

